Pipeline Thickness Calculation Methodology with Example | EveryEng

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Self-paced Beginner

Pipeline Thickness Calculation Methodology with Example

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3 enrolled

2775 views

$ 25

63 min

Anytime

English

2775 views

Anup Kumar DeyOwner of https://whatispiping.com/

Oil & Gas Upstream

Onshore Pipeline Engineering

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Foundational Learning
Access to Study Materials

Why enroll

- Need for Pipeline Thickness Calculation

- Pipeline Thickness Calculation Steps for Restrained and Unrestrained Pipelines

- Example of Pipeline Thickness Calculation for Aboveground Pipelines

- Buried Pipeline Thickness Calculation Case Study

- Additional Checks to satisfy pipeline thickness calculations

Your instructor

Anup Kumar Dey

Senior Piping Engineer

Owner of https://whatispiping.com/

20+ yrs experience·Oman

Is this course for you?

You should take this if

You work in Oil & Gas Upstream
You're a Onshore Pipeline Engineering professional
You prefer self-paced learning you can revisit

You should skip if

You need a different specialisation outside Onshore Pipeline Engineering
You need live interaction with an instructor

Course details

In the intricate world of engineering, particularly in sectors like oil and gas, chemical, and petrochemical industries, pipelines serve as the lifelines of operations. Ensuring the integrity and safety of these pipelines is paramount, and one crucial aspect of this is determining the appropriate thickness of the pipeline walls. This is where expertise in pipeline thickness calculation becomes indispensable.

Pipeline thickness calculation involves intricate mathematical and engineering principles. It's not merely about selecting a random thickness; rather, it requires a deep understanding of various factors such as internal pressure, external pressure, material properties, operational conditions, and regulatory standards.

The course delves into the fundamentals of fluid mechanics, stress analysis, material science, and applicable codes and standards.

The candidate will learn the following:

Need for Pipeline Thickness Calculation

Steps for Pipeline Thickness Calculation

Case Study for Pipeline Thickness Calculation for an Unrestrained Pipeline

Example of Pipeline Thickness Calculation for a Restrained Pipeline

Additional Checking Requirements

Overall, the course will add a new skill to the life of all piping and pipeline engineers who wish to learn the basics of pipeline thickness calculation with step-by-step methodology. Its a must for all fresh and beginner pipeline engineers who are ready to explore the world of pipeline engineering.

Course suitable for

Key topics covered

Need for Pipeline Thickness Calculation
Steps for Pipeline Thickness Calculation
Case Study for Pipeline Thickness Calculation for an Unrestrained Pipeline
Example of Pipeline Thickness Calculation for a Restrained Pipeline
Additional Checking Requirements

Course content

The course is readily available, allowing learners to start and complete it at their own pace.

5 lectures1 hr 3 min

Why to Calculate Pipeline Wall Thickness?
14 min
Steps for Pipeline Wall Thickness Calculation
16 min
Example of Pipeline Wall Thickness Calculation for Aboveground Pipeline
16 min
Pipeline Thickness Calculation for Restrained Pipelines
11 min
Additional Requirements
6 min

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Questions and Answers

Q: You're checking a line size late in EPC and google: "calculate pipeline wall thickness ASME B31.8 example". A 16 in OD gas pipeline, MAOP 8.0 MPa, API 5L X65 (SMYS 448 MPa), Class 1 location (F=0.72), E=1.0, T=1.0, CA=3.0 mm. What minimum required wall thickness do you calculate before mill tolerance?

A: Governing principle: Hoop stress limits pressure containment using a Barlow-based formulation. Applied here: t = (P·D)/(2·S·F·E·T) + CA = (8.0×406)/(2×448×0.72) + 3 ≈ 7.6 + 3.0 = 10.6 mm. The 8.3 mm option traps engineers who forget to add corrosion allowance after the stress calculation.

Q: You search: "pipeline mill tolerance effect on MAOP calculation" while reviewing a punch item. Nominal wall meets B31.8 pressure checks, but −12.5% mill tolerance isn't applied. What physical failure risk does this omission actually leave exposed?

A: Governing principle: Pressure containment depends on minimum actual wall, not nominal. Applied here: Ignoring mill tolerance raises true hoop stress by more than 10%, eroding burst margin at MAOP. Option A catches people who mix fracture control with pressure design; hydrotest stress is higher but short-term.

Q: Your lead asks you to justify a code choice and you google: "B31.4 vs B31.8 pipeline thickness design factor difference". A stabilized condensate line operates single-phase liquid at 6 MPa. Which statement best explains why B31.4 gives a different required thickness than B31.8 for the same pipe?

A: Governing principle: Allowable stress philosophy differs between liquid and gas codes. Applied here: B31.4 limits hoop stress using different fractions of SMYS and location class logic than B31.8. Option A tempts engineers who assume material strength changes with code rather than allowable usage.

Q: You're staring at a P&ID and searching: "P&ID pipeline spec missing wall thickness commissioning". The line tag shows NPS 20, Spec P-GAS-01, MAOP noted, but no wall thickness. What document would normally close this gap for pressure design verification?

A: Governing principle: Pressure design inputs live in piping specifications, not control documents. Applied here: The piping class defines material grade, wall, CA, and code basis tied to the line tag. Option D catches people who conflate hydraulic sizing with mechanical integrity.